Jar-closure.



PATENTED MAR. 12,'1907.

W. J. RUST.

JAR GLOSURE.

APPLICATION FILED 1530.11, 1905.

'l j my iw buckle at one point, and thereby admits air fhereby declare the following to be a full,

NITED STATES `WILLIAM J. RUST, OF SOLLITT, ILLINOIS.

JAR-CLOSURE.

Speccation of Letters Patent.

' Patented March 12,1907.

Application filed December 11, 1905. Serial No. 291,339.

To a/ZZ 'u1/tom, t may con/cern:

vBe it known that I, WILLIAM J. RUST, a citizen of the United States, residing at Sollitt, in the county of Kankakee and State of Illinois, have inventedcertain new and useful Improvements in J al1-Closures; and I do clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the same.

My invention relates to a novel construction in a j ar-closure, the object being to provide a device of this character which is extremely simple, durable, and el cient, and consists in the features of construction and combinations of-parts hereinafter fully described and claimed.

The accompanying drawing shows a fragmentary central Vertical section of a preserve-j ar provided with a closure constructed in accordance with my invention.

My invention is designed, broadly, to change the present method of sealing the socalled Mason jars without necessitating any variation in the present construction of the same to an extent which would necessitate any increase in cost of production or expensive changes in the tools for manufacturing the covers thereof.

The present Mason jars are provided below the neck with a shoulder on which the rubber washer seats, the latter bein compressed by means of the lower edge o the screw-cap. This action or relative disposition lof said washer causes the same to be subjected to a torsional strain, which frequently causes it to to the jar. l

, M present invention contemplates the emp oyment of Mason jars and covers as they are now constructed, and in said drawings A indicates a suitable jar, the neck B of which is externally threaded to receive the threaded cap or cover C. In the upper portion-of the latter is mounted a plate D of glass, porcelain, or the like, said plate D being loosely mounted `in said cover C and adapted to rotate therein. The said plate D is provided on its lower face adjacent its edge with an annular seat E, between which and the upper edge of the neck B a rubber or similar flexible washer F is compressed, thereby obviously sealing the jar and furthermore preventing contact of the contents thereof with any portion of said cap or cover C, which lat ter is of metal and is apt to deleteriously affect the contents of the jar by the action of said constituents thereof with the metal. The said plate D is preferably enlarged or rendered thicker along its edge than at its middle portion, as in icated at G, such enlarged portion or lannular shoulder being adapted to be engaged by an annular fiat portion of said cover C corresponding in location therewith and bearing upon said enlarged portion G when said cap is forced down to seal 'the jar, the strains on such plate l) being thus confined to the edge portion thereof, and -thus preventing breakage or fracture of the same by the pressure exerted thereon.

I claim as my invention- The combination with a jar havin an externally-threaded neck, yof a threade metallic cap adapted to receive and engage said neck, a at plate of. vitreous material disposed in the upper portion of said cap and provided on its lower face adjacent its edge with an annular washer-seat, a rubber washer disposed between said seat and the upper edge of said neck and an annular projection on the upper face of said plate corres ondmg in position with the washer-seat on t e lower face thereof and adapted to fit a corresponding recess in saidA cover, said plate being loosely mounted in said cover and rotatable relatively thereto.

In'testimony whereof I have signed my name in presence of two subscribing witnesses. WILLIAM J. RUST.

Witnesses:

RUDOLPH WM. Lo'r'z, ROBERT A. FISCHER. 

